Incinerated ashes: characteristics and potential for use in concrete-related applications

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Lynn, Ciarán John (2018). Incinerated ashes: characteristics and potential for use in concrete-related applications. University of Birmingham. Ph.D.

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Abstract

For this study on municipal incinerated bottom ash and sewage sludge ash, and their use in concrete related
applications, an original analytical systemisation method was developed. This involved sourcing of the global data, which were systematically coordinated into a collective form, for the analysis, evaluation and modelling work to be undertaken. An overview of the ash production is
provided initially, covering municipal solid waste and sewage sludge, incineration and ash processing. The physical and chemical properties of the ashes were then studied. On the use of MIBA/SSA as aggregate and cement components, the applications explored included cement clinker production, pastes, mortars, concrete, blocks. lightweight aggregate concrete and aerated concrete. Enviromnental impacts and case studies were also covered. Models were developed for strength estimation with the
use of the ashes as aggregate and cement components. It was determined that MlBA and SSA can offer value as aggregate and cementitious components, though conditions on their use are required. The ashes are suited for use at low contents in concrete products. Lightweight aggregate produced from MIBA/SSA exhibited similar properties to Lytag. Aerated concrete offered a particularly favourable outlet for use. Leaching tests showed that the ash heavy metals were immobilised within
the cement matrix.

Type of Work:

Thesis (Doctorates > Ph.D.)

Award Type:

Doctorates > Ph.D.

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